The captcha is basically a question to add two 2-digit numbers, e.g. 23+45. The question is returned as an SVG picture.
The hypothesis is that the need to engage brain even for 3 seconds is enough to stop 99% of the spammers, so the quality of comments should shoot through the roof.
The way it works is each comment has a sha1 hash and from that hash we can derive the 2 numbers. No state needed.
The hypothesis is that the need to engage brain even for 3 seconds is enough to stop 99% of the spammers, so the quality of comments should shoot through the roof.
The way it works is each comment has a sha1 hash and from that hash we can derive the 2 numbers. No state needed.
Sources of the service: https://github.com/comntr/captcha